drm/xe: Create ordered workqueue for GT TLB invalidation jobs

No sense to schedule GT TLB invalidation jobs in parallel which target
the same GT given these all contend on the same lock, create ordered
workqueue for GT TLB invalidation jobs.

v3:
 - Fix type in commmit message (Stuart)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Link: https://lore.kernel.org/r/20250724191216.4076566-4-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c

@@ -3,6 +3,8 @@
  * Copyright © 2023 Intel Corporation
  */
 
+#include <drm/drm_managed.h>
+
 #include "xe_gt_tlb_invalidation.h"
 
 #include "abi/guc_actions_abi.h"
@@ -123,6 +125,12 @@ int xe_gt_tlb_invalidation_init_early(struct xe_gt *gt)
 	INIT_DELAYED_WORK(&gt->tlb_invalidation.fence_tdr,
 			  xe_gt_tlb_fence_timeout);
 
+	gt->tlb_invalidation.job_wq =
+		drmm_alloc_ordered_workqueue(&gt_to_xe(gt)->drm, "gt-tbl-inval-job-wq",
+					     WQ_MEM_RECLAIM);
+	if (IS_ERR(gt->tlb_invalidation.job_wq))
+		return PTR_ERR(gt->tlb_invalidation.job_wq);
+
 	return 0;
 }
 

drivers/gpu/drm/xe/xe_gt_types.h

@@ -210,6 +210,8 @@ struct xe_gt {
 		 * xe_gt_tlb_fence_timeout after the timeut interval is over.
 		 */
 		struct delayed_work fence_tdr;
+		/** @wtlb_invalidation.wq: schedules GT TLB invalidation jobs */
+		struct workqueue_struct *job_wq;
 		/** @tlb_invalidation.lock: protects TLB invalidation fences */
 		spinlock_t lock;
 	} tlb_invalidation;